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F12 Cycles render 8x slower than the same render started from commandline
Open, Needs Triage by DeveloperPublic


System Information
Operating system: Ubuntu 18.04 64bit
Graphics card: GeForce GTX TITAN X (GM200), GeForce GTX 1080 Mobile (same behavior on both)

Blender Version
Broken: 2.80beta 17c15798c35f, 2.79b (same behavior with both)

Short description of error
When I start render from commanline, it is about eight times faster than the same render started by pressing F12 in Blender GUI.

Exact steps for others to reproduce the error
Try to open attached scene and run render by F12. Then try it from commanline by running

blender -b zzTmp-render-test2.blend -f 1



Event Timeline

maybe because in blender it also shows the image

Brecht Van Lommel (brecht) lowered the priority of this task from Needs Triage by Developer to Needs Information from User.EditedApr 3 2019, 6:19 PM
  • Does it help to select GLSL under Preferences > Viewport > Textures > Image Display Method?
  • Does it help to hide the image editor showing the render?

So displaying image takes about seven times its render time?

2 Brecht>

  • No
  • Seems that no. Tried to switch from image editor to 3D view and after some time back. Remaining render time didn't improved.
Bastien Montagne (mont29) raised the priority of this task from Needs Information from User to Needs Triage by Developer.Apr 11 2019, 12:24 PM